Preheat oven to 400. Mix the flour, salt, sugar, powder and soda in a big bowl. Cut the butter and chopped marzipan into the flour mixture with a pastry blender or your fingers. Stir the wet ingredients and poppyseeds in another bowl. Add the wet to the dry and mix with a scroon (see below) until combined. Knead the dough briefly. Roll it out on a floured surface to about 1" thickness and cut 12 scones. Arrange the scones on a lined baking sheet and top each one with a slice of marzipan before baking for about 20 minutes.